So I was tasked to do a simple customization in Receipt Entry. What I found was a very unusual bug. From what I can determine, only in Receipt Entry does the shortcuts for cutting, copying, and pasting not work.
You can also not copy from or paste into the script editor from an application outside of Epicor.
Epicor support was able to replicate this issue in both 10.2.100.13 and 10.1.600.24. So they created a Problem Case number: PRB0193932.
Sorry about the hypertext play with the bold text. I was having fun.